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THEORY OF OPERATION | |||
| FIGURE E.2 - ALTERNATOR OPERATION |
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| ELECTRODE | |
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| TERMINAL | |
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| OUTPUT |
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| CONTROL |
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| MIN | MAX |
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| (OFF) |
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THERMOSTART
BUTTON
TO IDLE / ENGINE
PROTECTION BOARD
TO IDLE/ENGINE
PROT. BOARD
S
T
A
R
STARTER T
SOLENOID E
R
RUN/STOP | IDLE SWITCH |
SWITCH |
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THERMOSTAT
INJECTION
PUMP
SOLENOID
SYSTEM
DIESEL
ENGINE
OIL
PRESSURE TEMP
SWITCH SWITCH
IDLE
SOLENOID
AC |
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(+) |
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AC |
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| REMOTE |
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| RHEOSTAT | LOCAL |
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| POLARITY | RHEOSTAT |
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| (JOB SELECTOR) |
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| SWITCH |
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RESISTOR |
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| FLASHING | TO HOUR METER |
| (+) |
| RESISTOR AND |
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SHUNT COILS |
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| DIODE |
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SERIES COILS |
| EXCITER |
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| WINDING | (+) |
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GENERATOR |
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| EXCITER |
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ARMATURE |
| ROTOR |
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AUXILIARY
POWER
WINDINGS
INTERPOLE COILS
115 VAC | 230 VAC |
to
to
| HOUR | IDLE / ENGINE |
AMMETER | METER | PROTECTION BOARD |
RECEPTACLES | RECEPTACLES | ||
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| TO |
| WORK | |
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| TERMINAL | ||
| FLASHING | ENGINE | TO ALTERNATOR | |
START | RESISTOR | |||
AND | FAULT |
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BUTTON | FLASH/SENSE | |||
DIODE | LIGHT |
TO INJECTION
PUMP SOLENOID
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ENGINE STARTING AND PROTEC- TION
Turning on the run/stop switch supplies 12VDC power to idler/engine protection PC board. During the first minute after the switch is placed in the on position, power is supplied to the Fuel solenoid, the hour meter, and flashing circuits for the engine alternator and the exciter alternator. The engine should be started during this first minute.
After one minute, the PC board will begin to monitor the oil pressure switch, cooling system temp switch, and the engine alternator. If a fault is detected in any of these systems, the engine fault light will come on and the engine will be shut down by shutting off the power to the fuel solenoid. These systems signal a fault by connecting the sense lead to chassis ground.
If the engine fault light turns on, the engine protection system must be reset by turning the run/stop switch off, then on again before attempting to restart the engine.
The machine is equipped with either a “Thermostart” or a glow plug starting system that is used for cold weath- er starting. Pressing the “Thermostart” or Glow Plug button activates this system. See the machine name- plate and engine manual for operating instructions and service information.
Pressing the start button activates the starter motor which cranks the engine. The start button is a momen- tary contact switch that routes power from the battery to the starting terminal of the starter solenoid. The starter will crank the engine even if the run/stop switch is in the off position.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion
